Triple-Shelled Co-VSe x Hollow Nanocages as Superior Bifunctional Electrode Materials for Efficient Pt-Free Dye-Sensitized Solar Cells and Hydrogen Evolution Reactions

Xing Qian, Weimin Wu, Yudi Niu, Jiahui Yang, Chong Xu, Kwok Yin Wong (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

Complex nanostructures with distinct spatial architectures and more active sites hold broad prospects in new energy conversion fields. Herein, a facile strategy was carried out to construct triple-shelled Co-VSex nanocages, starting with an ion-exchange process between Co-based zeolitic imidazolate framework-67 (ZIF-67) nanopolyhedrons and VO3 - followed by the formation of triple-shelled Co-VSex hollow nanocages during the process of increasing the solvothermal temperature under the assistance of SeO3 2-. Meanwhile, triple-shelled Co-VSx and yolk-double shell Co-VOx nanocages were fabricated as references by a similar process. Benefiting from the larger surface areas and more electrolyte adsorption sites, the triple-shelled Co-VSex nanocages exhibited excellent electrocatalytic performances when applied as the electrochemical catalysts for dye-sensitized solar cells (DSSC) and hydrogen evolution reactions (HER). More concretely, the DSSC based on the Co-VSex counter electrode showed outstanding power conversion efficiency of 9.68% when its Pt counterpart was 8.46%. Moreover, the Co-VSex electrocatalyst exhibited prominent HER performance with a low onset overpotential of 40 mV and a small Tafel slope of 39.1 mV dec-1 in an acidic solution.

Original languageEnglish
Pages (from-to)43278-43286
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number46
DOIs
Publication statusPublished - 20 Nov 2019

Keywords

  • bifunctional electrocatalysts
  • Co-VSe
  • dye-sensitized solar cells
  • hydrogen evolution reactions
  • Pt-free catalysts
  • triple-shelled nanocages

ASJC Scopus subject areas

  • Materials Science(all)

Cite this